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【简答题】
设离散型随机变量X的概率分布律为 (1)P(X=k)=b×3 k ，k=1，2，…，20； (2)P(X=k)=b×3 -k ，k=1，2，… 则制数b的值分别为( )和( )
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举一反三
【多选题】Certkiller .com's e-Commerce Web application contains a page named Products.aspx that uses data source and data-bound server controls. Customers use the server controls to search for products. The Pro...
A.
Move the Products.aspx page to the App_Code folder.
B.
Create a code-behind file for the Products.aspx page.
C.
Rename the Products.aspx page to Products.ascx.
D.
Remove all server controls from the Products.aspx page.
E.
Replace the Page directive with a Control directive.
【单选题】What does the e-customer want?
A.
Information about order and fulfillment.
B.
Information about similar products.
【单选题】What does an E.coli genomic library contain?
A.
Recombinant clones of genes from E.coli genome
B.
Just desired gene from E. coli
C.
Expressed genes
D.
Protein products
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